Astrology and meteorology have always had great importance for agriculture and navigation. They are described some measuring and forecasting instruments which, in the past, had a moderate success to navigate the Mediterranean, but they were forgotten because they were supplanted by other more reliable instruments in oceans. We refer to: parapegma, (made when meteorology was still a particular a…
The great travels for the geographical studies made it necessary, in order to establish the height of the elevations, to refer all the heights to the same surface to which to attribute the zero level, to make the results comparable